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Bird beak sign (esophagus)

Last revised by Dr Daniel J Bell on 27 Apr 2022

The bird's beak sign of the esophagus is used to refer to the tapering of the inferior esophagus in achalasia. The same appearance is also referred to as the rat's tail sign.

The appearance, although classically occurring in primary achalasia, can also occur in pseudoachalasia due to a gastric tumor involving the gastro-esophageal junction.

See also

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Cases and figures

  • Figure 1: photograph - bird beak
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  • Case 1: achalasia
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  • Case 2: cardiac achalasia
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  • Case 3
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  •  Case 4
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  • Case 5
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  • Case 6
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  • Case 7
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  • Case 8
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  • Case 9
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  • Case 10
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